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 TM 55-1905-219-14-4
3-17. LUBRICATING OIL COOLER - MAINTENANCE INSTRUCTIONS.
a. To perform its functions satisfactorily, the lubricating oil must be kept within the proper te perature limits. If the
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oil is too cold, it will not flow freely. If the oil is too hot, it cannot support the bearing loads, it cannot carry away enough
heat, and it may result in too great an oil flow. As a consequence, oil pressure may drop below acceptable limits and oil
consumption may become excessive.
b. In performing its lubricating and cooling functions, the oil absorbs a considerable amount of heat and this heat
must be dissipated by an oil cooler.
c. The engine is provided with an oil cooler mounted on the side of the cylinder block at the lower front corner. To
cool the lubricating oil used in marine gear, a separate oil cooler core is mounted adjacent to the engine oil cooler.
d. Oil from the lubricating oil pump flows through a passage in the oil cooler adaptor to the oil filter, through the oil
cooler, and finally through the outlet passage in the cooler adaptor which leads to the cylinder block oil galleries. The
engine coolant is pumped through the oil cooler and completely surrounds the oil cooler core.
e. To ensure continuing engine lubrication should the oil cooler become plugged, a by-pass valve is installed in the
oil cooler adaptor.
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